[Bug c++/65876] New: [5/6 Regression] [C++11] ICE in cxx_eval_call_expression, at cp/constexpr.c:1358

[maltsevm at gmail dot com]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=65876

            Bug ID: 65876
           Summary: [5/6 Regression] [C++11] ICE in
                    cxx_eval_call_expression, at cp/constexpr.c:1358
           Product: gcc
           Version: 6.0
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: c++
          Assignee: unassigned at gcc dot gnu.org
          Reporter: maltsevm at gmail dot com

Consider the following code:

$ cat test.cc
template<int>
struct duration
{
    constexpr duration() : r(0) {}

    template<int TPeriod>
    constexpr duration(duration<TPeriod> x) : r(x.count()) {}

    constexpr int count() { return 0; }

    int r;
};

struct Config {
    duration<1> timeout { duration<2>() };
};

Config make_config()
{
    return {};
}

struct ConfigArray {
    ConfigArray();
    Config all_configs[1];
};

ConfigArray::ConfigArray()
{
}

When trying to compile it with GCC 5.1 or trunk r222403 using the following
options:
$ g++ -c -std=c++11 ./test.cc

I get the following error:
./test.cc: In constructor 'ConfigArray::ConfigArray()':
./test.cc:28:26:   in constexpr expansion of 'Config()'
./test.cc:28:26:   in constexpr expansion of 'duration<1>(duration<2>())'
./test.cc:7:58:   in constexpr expansion of 'x.duration<<anonymous>
>::count<2>()'
./test.cc:28:26: internal compiler error: in cxx_eval_call_expression, at
cp/constexpr.c:1331
 ConfigArray::ConfigArray()
                          ^
0x7eb08e cxx_eval_call_expression
        /home/miyuki/gcc/src/gcc/cp/constexpr.c:1331
0x7ebf0c cxx_eval_constant_expression
        /home/miyuki/gcc/src/gcc/cp/constexpr.c:3038
0x7ef0ca cxx_eval_store_expression
        /home/miyuki/gcc/src/gcc/cp/constexpr.c:2651
0x7ec869 cxx_eval_constant_expression
        /home/miyuki/gcc/src/gcc/cp/constexpr.c:3112
0x7ec052 cxx_eval_constant_expression
        /home/miyuki/gcc/src/gcc/cp/constexpr.c:3365
0x7ec310 cxx_eval_constant_expression
        /home/miyuki/gcc/src/gcc/cp/constexpr.c:3229
0x7ec310 cxx_eval_constant_expression
        /home/miyuki/gcc/src/gcc/cp/constexpr.c:3229
0x7ebf64 cxx_eval_constant_expression
        /home/miyuki/gcc/src/gcc/cp/constexpr.c:3406
0x7f229e cxx_eval_statement_list
        /home/miyuki/gcc/src/gcc/cp/constexpr.c:2828
0x7ec76c cxx_eval_constant_expression
        /home/miyuki/gcc/src/gcc/cp/constexpr.c:3400
0x7eb188 cxx_eval_call_expression
        /home/miyuki/gcc/src/gcc/cp/constexpr.c:1365
0x7ebf0c cxx_eval_constant_expression
        /home/miyuki/gcc/src/gcc/cp/constexpr.c:3038
0x7ecc94 cxx_eval_constant_expression
        /home/miyuki/gcc/src/gcc/cp/constexpr.c:3097
0x7ef0ca cxx_eval_store_expression
        /home/miyuki/gcc/src/gcc/cp/constexpr.c:2651
0x7ec869 cxx_eval_constant_expression
        /home/miyuki/gcc/src/gcc/cp/constexpr.c:3112
0x7ec052 cxx_eval_constant_expression
        /home/miyuki/gcc/src/gcc/cp/constexpr.c:3365
0x7ec310 cxx_eval_constant_expression
        /home/miyuki/gcc/src/gcc/cp/constexpr.c:3229
0x7ec310 cxx_eval_constant_expression
        /home/miyuki/gcc/src/gcc/cp/constexpr.c:3229
0x7ebf64 cxx_eval_constant_expression
        /home/miyuki/gcc/src/gcc/cp/constexpr.c:3406
0x7f229e cxx_eval_statement_list
        /home/miyuki/gcc/src/gcc/cp/constexpr.c:2828
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